Top Definition
When a teacher's (or anyone for that matter) glasses are so thick that it appears they're made of fiberglass.
We could barely see her eyes peering through those fiberglasses.
av J.Robbins 21 januari 2007
1 more definition
Stronger than steel.

A material when launched at over 300 mph can penetrate and destroy Steel columns.
Orlando: 911 showed that fiberglass can cut through fucking steel.

Me: Super Man is nicknamed man of steel, should be man of fiberglass because thats apparently tougher than steel.
av rickya209 16 maj 2014

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